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| 型號： | OR4E2 |
| 廠商： | Lineage Power |
| 英文描述： | Field-Programmable Gate Arrays(現(xiàn)場可編程門陣列) |
| 中文描述： | 現(xiàn)場可編程門陣列（現(xiàn)場可編程門陣列） |
| 文件頁數(shù)： | 8/132頁 |
| 文件大?。?/td> | 2667K |
| 代理商： | OR4E2 |
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8
Lucent Technologies Inc.
Preliminary Data Sheet
August 2000
ORCA Series 4 FPGAs
Programmable Logic Cells
(continued)
The PFU is organized in a twin-quad fashion: two sets
of four LUTs and FFs that can be controlled indepen-
dently. Each PFU has two independent programmable
clocks, clock enables, local set/reset, and data selects
with one available per set of quad FFs.
LUTs may also be combined for use in arithmetic func-
tions using fast-carry chain logic in either 4-bit or 8-bit
modes. The carry-out of either mode may be registered
in the ninth FF for pipelining. Each PFU may also be
configured as a synchronous 32 x 4 single- or dual-port
RAM or ROM. The FFs (or latches) may obtain input
from LUT outputs or directly from invertible PFU inputs,
or they can be tied high or tied low. The FFs also have
programmable clock polarity, clock enables, and local
set/reset.
The LUTs can be programmed to operate in one of
three modes: combinatorial, ripple, or memory. In com-
binatorial mode, the LUTs can realize any 4-, 5-, or
6-input logic function and many multilevel logic func-
tions using ORCAs SWL connections. In ripple mode,
the high-speed carry logic is used for arithmetic func-
tions, comparator functions, or enhanced data path
functions. In memory mode, the LUTs can be used as a
32 x 4 synchronous RAM or ROM, in either single- or
dual-port mode.
The SLIC is connected from PLC routing resources
and from the outputs of the PFU. It contains eight
3-state, bidirectional buffers and logic to perform up to
a 10-bit AND function for decoding, or an AND-OR with
optional INVERT to perform PAL-like functions. The
3-state drivers in the SLIC and their direct connections
from the PFU outputs make fast, true 3-state buses
possible within the FPGA.
Programmable Function Unit
The PFUs are used for logic. Each PFU has 53 exter-
nal inputs and 20 outputs and can operate in several
modes. The functionality of the inputs and outputs
depends on the operating mode.
The PFU uses 36 data input lines for the LUTs, eight
data input lines for the latches/FFs, eight control inputs
(CLK[1:0], CE[1:0], LSR[1:0], SEL[1:0]), and a carry
input (CIN) for fast arithmetic functions and general-
purpose data input for the ninth FF. There are eight
combinatorial data outputs (one from each LUT), eight
latched/registered outputs (one from each latch/FF), a
carry-out (COUT), and a registered carry-out (REG-
COUT) that comes from the ninth FF. The carry-out sig-
nals are used principally for fast arithmetic functions.
There are also two dedicated F6 mode outputs which
are for the 6-input LUT function and 8-to-1 MUX.
Figure 2 and Figure 3 show high-level and detailed
views of the ports in the PFU, respectively. The eight
sets of LUT inputs are labeled as K0 through K7 with
each of the four inputs to each LUT having a suffix
of _x, where x is a number from 0 to 3.
There are four F5 inputs labeled A through D. These
are used for additional LUT inputs for 5- and 6-input
LUTs or as a selector for multiplexing two 4-input LUTs.
Four adjacent LUT4s can also be multiplexed together
with a 4-to-1 MUX to create a 6-input LUT. The eight
direct data inputs to the latches/FFs are labeled as
DIN[7:0]. Registered LUT outputs are shown as Q[7:0],
and combinatorial LUT outputs are labeled as F[7:0].
The PFU implements combinatorial logic in the LUTs
and sequential logic in the latches/FFs. The LUTs are
static random access memory (SRAM) and can be
used for read/write or ROM.
Each latch/FF can accept data from its associated LUT.
Alternatively, the latches/FFs can accept direct data
from DIN[7:0], eliminating the LUT delay if no combina-
torial function is needed. Additionally, the CIN input can
be used as a direct data source for the ninth FF. The
LUT outputs can bypass the latches/FFs, which
reduces the delay out of the PFU. It is possible to use
the LUTs and latches/FFs more or less independently,
allowing, for instance, a comparator function in the
LUTs simultaneously with a shift register in the FFs.
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